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Linux/drivers/usb/host/ohci-s3c2410.c

  1 /*
  2  * OHCI HCD (Host Controller Driver) for USB.
  3  *
  4  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
  5  * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
  6  * (C) Copyright 2002 Hewlett-Packard Company
  7  *
  8  * USB Bus Glue for Samsung S3C2410
  9  *
 10  * Written by Christopher Hoover <ch@hpl.hp.com>
 11  * Based on fragments of previous driver by Russell King et al.
 12  *
 13  * Modified for S3C2410 from ohci-sa1111.c, ohci-omap.c and ohci-lh7a40.c
 14  *      by Ben Dooks, <ben@simtec.co.uk>
 15  *      Copyright (C) 2004 Simtec Electronics
 16  *
 17  * Thanks to basprog@mail.ru for updates to newer kernels
 18  *
 19  * This file is licenced under the GPL.
 20 */
 21 
 22 #include <linux/clk.h>
 23 #include <linux/io.h>
 24 #include <linux/kernel.h>
 25 #include <linux/module.h>
 26 #include <linux/platform_device.h>
 27 #include <linux/platform_data/usb-ohci-s3c2410.h>
 28 #include <linux/usb.h>
 29 #include <linux/usb/hcd.h>
 30 
 31 #include "ohci.h"
 32 
 33 
 34 #define valid_port(idx) ((idx) == 1 || (idx) == 2)
 35 
 36 /* clock device associated with the hcd */
 37 
 38 
 39 #define DRIVER_DESC "OHCI S3C2410 driver"
 40 
 41 static const char hcd_name[] = "ohci-s3c2410";
 42 
 43 static struct clk *clk;
 44 static struct clk *usb_clk;
 45 
 46 /* forward definitions */
 47 
 48 static int (*orig_ohci_hub_control)(struct usb_hcd  *hcd, u16 typeReq,
 49                         u16 wValue, u16 wIndex, char *buf, u16 wLength);
 50 static int (*orig_ohci_hub_status_data)(struct usb_hcd *hcd, char *buf);
 51 
 52 static void s3c2410_hcd_oc(struct s3c2410_hcd_info *info, int port_oc);
 53 
 54 /* conversion functions */
 55 
 56 static struct s3c2410_hcd_info *to_s3c2410_info(struct usb_hcd *hcd)
 57 {
 58         return dev_get_platdata(hcd->self.controller);
 59 }
 60 
 61 static void s3c2410_start_hc(struct platform_device *dev, struct usb_hcd *hcd)
 62 {
 63         struct s3c2410_hcd_info *info = dev_get_platdata(&dev->dev);
 64 
 65         dev_dbg(&dev->dev, "s3c2410_start_hc:\n");
 66 
 67         clk_prepare_enable(usb_clk);
 68         mdelay(2);                      /* let the bus clock stabilise */
 69 
 70         clk_prepare_enable(clk);
 71 
 72         if (info != NULL) {
 73                 info->hcd       = hcd;
 74                 info->report_oc = s3c2410_hcd_oc;
 75 
 76                 if (info->enable_oc != NULL)
 77                         (info->enable_oc)(info, 1);
 78         }
 79 }
 80 
 81 static void s3c2410_stop_hc(struct platform_device *dev)
 82 {
 83         struct s3c2410_hcd_info *info = dev_get_platdata(&dev->dev);
 84 
 85         dev_dbg(&dev->dev, "s3c2410_stop_hc:\n");
 86 
 87         if (info != NULL) {
 88                 info->report_oc = NULL;
 89                 info->hcd       = NULL;
 90 
 91                 if (info->enable_oc != NULL)
 92                         (info->enable_oc)(info, 0);
 93         }
 94 
 95         clk_disable_unprepare(clk);
 96         clk_disable_unprepare(usb_clk);
 97 }
 98 
 99 /* ohci_s3c2410_hub_status_data
100  *
101  * update the status data from the hub with anything that
102  * has been detected by our system
103 */
104 
105 static int
106 ohci_s3c2410_hub_status_data(struct usb_hcd *hcd, char *buf)
107 {
108         struct s3c2410_hcd_info *info = to_s3c2410_info(hcd);
109         struct s3c2410_hcd_port *port;
110         int orig;
111         int portno;
112 
113         orig = orig_ohci_hub_status_data(hcd, buf);
114 
115         if (info == NULL)
116                 return orig;
117 
118         port = &info->port[0];
119 
120         /* mark any changed port as changed */
121 
122         for (portno = 0; portno < 2; port++, portno++) {
123                 if (port->oc_changed == 1 &&
124                     port->flags & S3C_HCDFLG_USED) {
125                         dev_dbg(hcd->self.controller,
126                                 "oc change on port %d\n", portno);
127 
128                         if (orig < 1)
129                                 orig = 1;
130 
131                         buf[0] |= 1<<(portno+1);
132                 }
133         }
134 
135         return orig;
136 }
137 
138 /* s3c2410_usb_set_power
139  *
140  * configure the power on a port, by calling the platform device
141  * routine registered with the platform device
142 */
143 
144 static void s3c2410_usb_set_power(struct s3c2410_hcd_info *info,
145                                   int port, int to)
146 {
147         if (info == NULL)
148                 return;
149 
150         if (info->power_control != NULL) {
151                 info->port[port-1].power = to;
152                 (info->power_control)(port-1, to);
153         }
154 }
155 
156 /* ohci_s3c2410_hub_control
157  *
158  * look at control requests to the hub, and see if we need
159  * to take any action or over-ride the results from the
160  * request.
161 */
162 
163 static int ohci_s3c2410_hub_control(
164         struct usb_hcd  *hcd,
165         u16             typeReq,
166         u16             wValue,
167         u16             wIndex,
168         char            *buf,
169         u16             wLength)
170 {
171         struct s3c2410_hcd_info *info = to_s3c2410_info(hcd);
172         struct usb_hub_descriptor *desc;
173         int ret = -EINVAL;
174         u32 *data = (u32 *)buf;
175 
176         dev_dbg(hcd->self.controller,
177                 "s3c2410_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n",
178                 hcd, typeReq, wValue, wIndex, buf, wLength);
179 
180         /* if we are only an humble host without any special capabilities
181          * process the request straight away and exit */
182 
183         if (info == NULL) {
184                 ret = orig_ohci_hub_control(hcd, typeReq, wValue,
185                                        wIndex, buf, wLength);
186                 goto out;
187         }
188 
189         /* check the request to see if it needs handling */
190 
191         switch (typeReq) {
192         case SetPortFeature:
193                 if (wValue == USB_PORT_FEAT_POWER) {
194                         dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
195                         s3c2410_usb_set_power(info, wIndex, 1);
196                         goto out;
197                 }
198                 break;
199 
200         case ClearPortFeature:
201                 switch (wValue) {
202                 case USB_PORT_FEAT_C_OVER_CURRENT:
203                         dev_dbg(hcd->self.controller,
204                                 "ClearPortFeature: C_OVER_CURRENT\n");
205 
206                         if (valid_port(wIndex)) {
207                                 info->port[wIndex-1].oc_changed = 0;
208                                 info->port[wIndex-1].oc_status = 0;
209                         }
210 
211                         goto out;
212 
213                 case USB_PORT_FEAT_OVER_CURRENT:
214                         dev_dbg(hcd->self.controller,
215                                 "ClearPortFeature: OVER_CURRENT\n");
216 
217                         if (valid_port(wIndex))
218                                 info->port[wIndex-1].oc_status = 0;
219 
220                         goto out;
221 
222                 case USB_PORT_FEAT_POWER:
223                         dev_dbg(hcd->self.controller,
224                                 "ClearPortFeature: POWER\n");
225 
226                         if (valid_port(wIndex)) {
227                                 s3c2410_usb_set_power(info, wIndex, 0);
228                                 return 0;
229                         }
230                 }
231                 break;
232         }
233 
234         ret = orig_ohci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
235         if (ret)
236                 goto out;
237 
238         switch (typeReq) {
239         case GetHubDescriptor:
240 
241                 /* update the hub's descriptor */
242 
243                 desc = (struct usb_hub_descriptor *)buf;
244 
245                 if (info->power_control == NULL)
246                         return ret;
247 
248                 dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n",
249                         desc->wHubCharacteristics);
250 
251                 /* remove the old configurations for power-switching, and
252                  * over-current protection, and insert our new configuration
253                  */
254 
255                 desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM);
256                 desc->wHubCharacteristics |= cpu_to_le16(0x0001);
257 
258                 if (info->enable_oc) {
259                         desc->wHubCharacteristics &= ~cpu_to_le16(
260                                 HUB_CHAR_OCPM);
261                         desc->wHubCharacteristics |=  cpu_to_le16(
262                                 0x0008 |
263                                 0x0001);
264                 }
265 
266                 dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n",
267                         desc->wHubCharacteristics);
268 
269                 return ret;
270 
271         case GetPortStatus:
272                 /* check port status */
273 
274                 dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);
275 
276                 if (valid_port(wIndex)) {
277                         if (info->port[wIndex-1].oc_changed)
278                                 *data |= cpu_to_le32(RH_PS_OCIC);
279 
280                         if (info->port[wIndex-1].oc_status)
281                                 *data |= cpu_to_le32(RH_PS_POCI);
282                 }
283         }
284 
285  out:
286         return ret;
287 }
288 
289 /* s3c2410_hcd_oc
290  *
291  * handle an over-current report
292 */
293 
294 static void s3c2410_hcd_oc(struct s3c2410_hcd_info *info, int port_oc)
295 {
296         struct s3c2410_hcd_port *port;
297         struct usb_hcd *hcd;
298         unsigned long flags;
299         int portno;
300 
301         if (info == NULL)
302                 return;
303 
304         port = &info->port[0];
305         hcd = info->hcd;
306 
307         local_irq_save(flags);
308 
309         for (portno = 0; portno < 2; port++, portno++) {
310                 if (port_oc & (1<<portno) &&
311                     port->flags & S3C_HCDFLG_USED) {
312                         port->oc_status = 1;
313                         port->oc_changed = 1;
314 
315                         /* ok, once over-current is detected,
316                            the port needs to be powered down */
317                         s3c2410_usb_set_power(info, portno+1, 0);
318                 }
319         }
320 
321         local_irq_restore(flags);
322 }
323 
324 /* may be called without controller electrically present */
325 /* may be called with controller, bus, and devices active */
326 
327 /*
328  * usb_hcd_s3c2410_remove - shutdown processing for HCD
329  * @dev: USB Host Controller being removed
330  * Context: !in_interrupt()
331  *
332  * Reverses the effect of usb_hcd_3c2410_probe(), first invoking
333  * the HCD's stop() method.  It is always called from a thread
334  * context, normally "rmmod", "apmd", or something similar.
335  *
336 */
337 
338 static void
339 usb_hcd_s3c2410_remove(struct usb_hcd *hcd, struct platform_device *dev)
340 {
341         usb_remove_hcd(hcd);
342         s3c2410_stop_hc(dev);
343         usb_put_hcd(hcd);
344 }
345 
346 /**
347  * usb_hcd_s3c2410_probe - initialize S3C2410-based HCDs
348  * Context: !in_interrupt()
349  *
350  * Allocates basic resources for this USB host controller, and
351  * then invokes the start() method for the HCD associated with it
352  * through the hotplug entry's driver_data.
353  *
354  */
355 static int usb_hcd_s3c2410_probe(const struct hc_driver *driver,
356                                   struct platform_device *dev)
357 {
358         struct usb_hcd *hcd = NULL;
359         struct s3c2410_hcd_info *info = dev_get_platdata(&dev->dev);
360         int retval;
361 
362         s3c2410_usb_set_power(info, 1, 1);
363         s3c2410_usb_set_power(info, 2, 1);
364 
365         hcd = usb_create_hcd(driver, &dev->dev, "s3c24xx");
366         if (hcd == NULL)
367                 return -ENOMEM;
368 
369         hcd->rsrc_start = dev->resource[0].start;
370         hcd->rsrc_len   = resource_size(&dev->resource[0]);
371 
372         hcd->regs = devm_ioremap_resource(&dev->dev, &dev->resource[0]);
373         if (IS_ERR(hcd->regs)) {
374                 retval = PTR_ERR(hcd->regs);
375                 goto err_put;
376         }
377 
378         clk = devm_clk_get(&dev->dev, "usb-host");
379         if (IS_ERR(clk)) {
380                 dev_err(&dev->dev, "cannot get usb-host clock\n");
381                 retval = PTR_ERR(clk);
382                 goto err_put;
383         }
384 
385         usb_clk = devm_clk_get(&dev->dev, "usb-bus-host");
386         if (IS_ERR(usb_clk)) {
387                 dev_err(&dev->dev, "cannot get usb-bus-host clock\n");
388                 retval = PTR_ERR(usb_clk);
389                 goto err_put;
390         }
391 
392         s3c2410_start_hc(dev, hcd);
393 
394         retval = usb_add_hcd(hcd, dev->resource[1].start, 0);
395         if (retval != 0)
396                 goto err_ioremap;
397 
398         device_wakeup_enable(hcd->self.controller);
399         return 0;
400 
401  err_ioremap:
402         s3c2410_stop_hc(dev);
403 
404  err_put:
405         usb_put_hcd(hcd);
406         return retval;
407 }
408 
409 /*-------------------------------------------------------------------------*/
410 
411 static struct hc_driver __read_mostly ohci_s3c2410_hc_driver;
412 
413 static int ohci_hcd_s3c2410_drv_probe(struct platform_device *pdev)
414 {
415         return usb_hcd_s3c2410_probe(&ohci_s3c2410_hc_driver, pdev);
416 }
417 
418 static int ohci_hcd_s3c2410_drv_remove(struct platform_device *pdev)
419 {
420         struct usb_hcd *hcd = platform_get_drvdata(pdev);
421 
422         usb_hcd_s3c2410_remove(hcd, pdev);
423         return 0;
424 }
425 
426 #ifdef CONFIG_PM
427 static int ohci_hcd_s3c2410_drv_suspend(struct device *dev)
428 {
429         struct usb_hcd *hcd = dev_get_drvdata(dev);
430         struct platform_device *pdev = to_platform_device(dev);
431         bool do_wakeup = device_may_wakeup(dev);
432         int rc = 0;
433 
434         rc = ohci_suspend(hcd, do_wakeup);
435         if (rc)
436                 return rc;
437 
438         s3c2410_stop_hc(pdev);
439 
440         return rc;
441 }
442 
443 static int ohci_hcd_s3c2410_drv_resume(struct device *dev)
444 {
445         struct usb_hcd *hcd = dev_get_drvdata(dev);
446         struct platform_device *pdev = to_platform_device(dev);
447 
448         s3c2410_start_hc(pdev, hcd);
449 
450         ohci_resume(hcd, false);
451 
452         return 0;
453 }
454 #else
455 #define ohci_hcd_s3c2410_drv_suspend    NULL
456 #define ohci_hcd_s3c2410_drv_resume     NULL
457 #endif
458 
459 static const struct dev_pm_ops ohci_hcd_s3c2410_pm_ops = {
460         .suspend        = ohci_hcd_s3c2410_drv_suspend,
461         .resume         = ohci_hcd_s3c2410_drv_resume,
462 };
463 
464 static struct platform_driver ohci_hcd_s3c2410_driver = {
465         .probe          = ohci_hcd_s3c2410_drv_probe,
466         .remove         = ohci_hcd_s3c2410_drv_remove,
467         .shutdown       = usb_hcd_platform_shutdown,
468         .driver         = {
469                 .owner  = THIS_MODULE,
470                 .name   = "s3c2410-ohci",
471                 .pm     = &ohci_hcd_s3c2410_pm_ops,
472         },
473 };
474 
475 static int __init ohci_s3c2410_init(void)
476 {
477         if (usb_disabled())
478                 return -ENODEV;
479 
480         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
481         ohci_init_driver(&ohci_s3c2410_hc_driver, NULL);
482 
483         /*
484          * The Samsung HW has some unusual quirks, which require
485          * Sumsung-specific workarounds. We override certain hc_driver
486          * functions here to achieve that. We explicitly do not enhance
487          * ohci_driver_overrides to allow this more easily, since this
488          * is an unusual case, and we don't want to encourage others to
489          * override these functions by making it too easy.
490          */
491 
492         orig_ohci_hub_control = ohci_s3c2410_hc_driver.hub_control;
493         orig_ohci_hub_status_data = ohci_s3c2410_hc_driver.hub_status_data;
494 
495         ohci_s3c2410_hc_driver.hub_status_data  = ohci_s3c2410_hub_status_data;
496         ohci_s3c2410_hc_driver.hub_control      = ohci_s3c2410_hub_control;
497 
498         return platform_driver_register(&ohci_hcd_s3c2410_driver);
499 }
500 module_init(ohci_s3c2410_init);
501 
502 static void __exit ohci_s3c2410_cleanup(void)
503 {
504         platform_driver_unregister(&ohci_hcd_s3c2410_driver);
505 }
506 module_exit(ohci_s3c2410_cleanup);
507 
508 MODULE_DESCRIPTION(DRIVER_DESC);
509 MODULE_LICENSE("GPL");
510 MODULE_ALIAS("platform:s3c2410-ohci");
511 

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